[MacPorts] #28087: bump vigra to 1.7.1

[MacPorts]

#28087: bump vigra to 1.7.1
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 Reporter:  michaelld@…             |       Owner:  benjamin.seppke@…        
     Type:  defect                  |      Status:  new                      
 Priority:  Normal                  |   Milestone:                           
Component:  ports                   |     Version:  1.9.2                    
 Keywords:                          |        Port:  vigra                    
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Comment(by michaelld@…):

 Let me give you changes a shot & see what happens.  I know that Python .so
 file self-id's are OK to not include path and such (same happens for Qt4
 plugins; Qt actually provides a specific type where further linking to the
 resulting plugin isn't supposed to happen).  Otherwise, yeah, it's
 possible that the Python linking is messed up.  Do you want me to post my
 changes (to the original Portfile) for you to check out one last time, or
 just go ahead and check them in once it's working for me?

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Ticket URL: <https://trac.macports.org/ticket/28087#comment:4>
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